1. Core Technology: The BYG22D utilizes "Avalanche" technology, enabling it to withstand and dissipate repetitive avalanche energy during reverse breakdown, resulting in a more controlled failure mode. The ES2DA is designated as "Standard" technology, typically lacking equivalent avalanche ratings or repetitive avalanche energy capability. In harsh applications prone to voltage spikes (e.g., inductive load switching, lightning surges), the BYG22D offers superior system robustness and reliability. 2. Forward Voltage Drop (Vf): The ES2DA's Vf (0.92V) is significantly lower than that of the BYG22D (1.1V), indicating lower power loss and higher efficiency during conduction. This advantage reduces thermal rise and improves system energy efficiency. 3. Reverse Leakage Current (Ir): The BYG22D features a lower leakage current (1µA) compared to the ES2DA (5µA). This gives the BYG22D an edge in high-temperature applications or those with extremely stringent static power consumption requirements. For most power supply applications, however, this difference is negligible. 4. Parameter Completeness: The ES2DA datasheet specifies a junction capacitance parameter (25pF), which the BYG22D datasheet omits. This information is valuable for evaluating switching losses and potential EMI impact in high-frequency switching applications, making the ES2DA's specifications more transparent in this regard. Summary: The feasibility of substitution is entirely application-dependent. For efficiency-sensitive applications with well-defined and controlled voltage stress (e.g., standard DC-DC rectification), the ES2DA is the preferable choice. For reliability-critical scenarios requiring protection against unpredictable high-voltage transients, the avalanche capability of the BYG22D is a crucial safeguard, and a simple replacement is not advisable.